It is comparatively simple to keep the school free from this worst of all evils.

使学校脱离这种所有邪恶中最坏的邪恶，相对来说比较简单。

youdao

And legend has it that villagers anxious about traffic safety need only bury a loris beneath a new road to keep it free from accidents.

而且传说中，担心交通安全的村民只需将一只懒猴埋在新建道路的路面下，就可以永保这条路没有车祸。

youdao

In addition to using "hands-free" devices, which keep mobile phones away from the head and body during phone calls, exposure is also reduced by limiting the number and length of calls.

除使用“免提”装置在通话时将移动电话与头部和身体保持一定距离以外，限制通话次数和时间，也会减少接触量。

youdao

Local governments fought losing battles to keep roads clear, while residents struggled to free their cars from massive snowdrifts.

VOA: standard.2010.02.07

Having fought to free Western Europe from Nazi domination, Washington was determined to keep Western Europe free from Soviet domination.

FORBES: NATO's Lack Of Any Serious Purpose Means It Should Retire

In case of injury, engineered bandages with embedded antimicrobial nanoparticles will stop deep bleeding in a matter of minutes and keep the wound free from infection.

FORBES: Nanotech Takes On Homeland Terror

Newspaper bosses have said their proposals would introduce a rigorous system of regulation but keep the press free from state interference.

BBC: Press regulation royal charter delayed by ministers